Nurling-tool.



R. D. BABSON.

NURLING TOOL. APPLICATION FILED DEG. 27, 1911.

Patented Nov. 3, 1-914.

2 SHEBTSSHEET 1.

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THE NORRIS PETEkS CO.. PH070-L!THD.. WASHINGTON. D. C.

R. D. BABSON.

NURLING TOOL, APPLICATION 11,111) 111:0. 27, 1911.

- mils- Patented Nov. 3,-1914.

2 SHEETS-SHEET 2.

THE NOR'RIs PETERS 60., PHOTOJJTI-pl, was ara UNITED sra'rns PATENT OFFICE.

ROGER n. BABsoN, on BROOKLINE, ivikssacnusnrrsnssienon T0 BABSON & now MANUFACTURING COMPANY, or BOSTON, MASSACHUSETTS, A oonroaarroiv or MASSACHUSETTS.

NURLING-TOOL.

Specificationof Letters Patent. P t 1t dNov.3,1914.

Application filed December 27, 1911. Serial No. 668,081. I

To all whom it may concern Be it known that I, ROGER D. BABSON, a citizen of the United States, residing at Br-ookline, in the county of Norfolk and State of Massachusetts, have invented a new.

and useful Improvement in Nurling-Tools, of which the following is a specification, reference being had therein to the accompanying drawings. I

This invention relates to. nurling tools and more particularly to a nurling tool designed to be operated automatically and adjusted to Work of any diameter.

In the ordinary form or" nurling tool the nurling is done by means of rolls which are set to suit the diameter of the work to be nurled and the work is then passed between the rolls. This device is open to two serious objections. In the first place the rolls have to be reset for each diameter of work; and in the second place the nurling must be done continuously, that is, the nurling on any piece of work beginsat one end and is continuous so far as it goes. The latter defect is due to the fact that the work is pushed between the rolls, nurled to the desired amount and then withdrawn. It is impossible to divide the nurling intobands or stripes because the rolls cannot be released from the work.

The main object of my invention is to provide a'nurling tool by means of which the work may be nurled at any desired portion continuously or intermittently and to this end I provide nurling rolls which are thrown into operative position and out of operative position whenever necessary.

A further object of the invention is to provide a nurling tool which does not require adjustment in order to accommodate work of any diameter.

Another object is to provide a nurling tool which may be operated automatically and which is adapted to be used in connection with automatic screw machines and similar devices.

Other objects of my invention will be specifically described hereinafter..

In the accompanyingdrawings illustrating my invention, Figure 1 is a plan view of a nurling tool constructed in accordance with-my invention; Fig. 2 is a front elevation of the same; and Fig.3 is a side elevation of the same.

Briefly, my invention consists in providing a plurality of nurling rolls so mounted and arranged that they may be operated to grip the work to be nurled, irrespective of its diameter, and may at any time be re leased therefrom.

In the illustrated embodiment of my invention, I have shown a nurling tool which is adapted for use in an automatic. screw machine or other similar device and in this preferred form. 5 designates a supportv provided witha shank 6 whereby it may be mounted in the. turret or tail-stockof an automatic screw machine or similar device.

bore 7 to permit the work to pass into the The shank 6 is preferably provided with a I shankwhen necessary. Upon the support i arearranged two carriers 8 which are transversely movable on said support and may be secured thereto by means of adove-tail portion or guide 9 engaging the corresponding slots in the carriers. Each of these carriers has an upwardly extending portion 10 car- I rying one or more nurling rolls 11. The number or arrangement of these rolls may be varied, but I prefer to use three and ar range them as shown in. the drawings,

onthe other,the single roll being arranged midway of the other two so that the three rollstogether when gripping the work will hold it firmly against slipping.

The nurling rolls may be mounted in the carriers in any suitablemanner. drawings the ,extending portion 10' of each carrier is shown as-bein'g provided with a recess 12 in whichthe roll 01 0115, as the case may be, are rotatably mounted on spindles 13. I

The lateral movement of the carriers may be secured by any suitable means and one such comprises a stud 14L projecting downnamely, two rolls on one carrier and one roll In the wardly fromthe bottom of each carrler and known and may be adapted to operate my device by any one skilled in the art.

Although in the embodiment shown. in

the drawings both carriers are movable, such construction is not absolutely necessary, as either of the carriers may be fixed and the same result secured by the movement of the other carrier to and from the fixed carrier.

In order that the carriers may be restored to an inoperative position when the pressure exerted by the cams or levers on the studs is released, I provide helical springs 20, preferably four in number, and arranged as.

shown in Fig. 1, in pairs. To hold the springs in place against lateral movement they are mounted on spindles 21 having centrally disposed shoulders '22. Each carrier is provided with two chambers 23 to accommodate the ends of two of the springs and with a bore 24: of smaller diameter to receive the ends of the spindles when the carriers are moved toward each other, compressing the springs. Any suitable means, however, may be used for this purpose and I do not desire to limit myself to the specific means shown.

In the operation of my tool the work to be nurled is properly adjusted in a central position between the nurling rolls and the latter are then pressed against it by means of the cams or levers operating upon the rolls 15 and studs 14. When the work has been nurled to the desired amoimt the pressure on the rolls 15 is released and the carriers are then thrown back or separated by means of the springs 20 and the nurling rolls thereby removed from the work. If it is desired to add a band of nurling at another point the work is fed forward and the rolls again thrown against it and in operative position.

By means of my tool, the work may be nurled continuously inbands or stripes or in spiral form, or in various other ways.

Within certain limits my tool maybe applied to work of any diameter as it begins to operate as soon as the nurling rolls are thrown against the work with the necessary pressure all of which can be regulated by the cams or levers which operate the carriers.

While the preferred embodiment of the present invention has been illustrated. and described, it is to beunderstood that the present invention is not limited to the exact details of construction shown and described but may be otherwise embodied within the spirit of the invention and the scope of the following claims.

What I claim is 1. A nurling tool comprising a nurlcarrier support, a guide on the support, two

longitudinally-disposed nurl carriers engaging the guide and carried by the support, normally held out of operative position by springs located parallel and close to said guide, said carriers having studs secured thereto, the nurl-carrier support being provided with slots in which said studs are adapted to move.

2. A nurling tool comprising a nurlcarrier support having a guide, two longitudinally-moving oppositely-disposed nurl carriers thereon, one of said carriers having two nurls and the other of said carriers having one nurl, the latter, nurl being positioned midway between the two former nurls so that all the said nurls act as a steady rest for the workwhen they are in operative position, and means for holding said carriers in operative position.

' 3. A nurling tool comprising a support, two longitudinally-disposed nurl carriers mounted thereon, said carriers being pro vided with studs carrying rolls rotatably secured to the lower ends thereof, said rolls i support, two carriers movably mounted thereon and provided with studs whereby the said carriers may be moved to and from each other, a nurling roll carried by one of said carriers, a pair Of nurling rolls carried by the other of said carriers, said single roll being arranged mid-way of the other two in order that the three rolls may grip the work firmly when in an operative position, and spring-actuated means for holding said carriers normally in an inoperative position.

In testimony whereof, I hereunto set my hand in the presence of two subscribing witnesses, this the twenty-sixth day of De cember, 1911.

ROGER D. BABSON. Witnesses:

F. J. V. DAKIN, GERTRUDE F. COLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

